CN113509152B

CN113509152B - Method and device for detecting skin physiological parameters and intelligent terminal

Info

Publication number: CN113509152B
Application number: CN202111079880.2A
Authority: CN
Inventors: 周勇
Original assignee: Shenzhen Maidu Technology Co ltd
Current assignee: Shenzhen Maidu Technology Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2021-12-03
Anticipated expiration: 2041-09-15
Also published as: CN113509152A

Abstract

The application relates to a method and a device for detecting skin physiological parameters and an intelligent terminal. The method comprises the following steps: emitting, by an emitting module, light of one or more wavelengths towards a skin area under test; respectively polarizing and analyzing the light emitted by the emitting module and the reflected light according to a preset modulation mode through a modulatable polarizer/analyzer group so as to obtain a plurality of polarization attributes related to the detected skin area, wherein the quantity of the plurality of polarization attributes and the relation among the plurality of polarization attributes are determined according to the preset modulation mode; and calculating the measured skin physiological parameter related to the measured skin area from the plurality of polarization attributes by using the data model between the measured skin physiological parameter and the polarization attributes. The preset modulation mode is set according to the measured skin physiological parameter so that at least one polarization attribute in the plurality of polarization attributes has higher sensitivity to the change of the measured skin physiological parameter relative to another polarization attribute in the plurality of polarization attributes. This improves the measurement effect.

Description

Method and device for detecting skin physiological parameters and intelligent terminal

Technical Field

The application relates to the technical field of internet, in particular to the technical field of intelligent terminals, and particularly relates to a method and a device for detecting skin physiological parameters and an intelligent terminal.

Background

With the development of internet technology and intelligent terminal technology, sensors and intelligent terminals with the function of monitoring human body-related physiological parameters have been developed greatly, and applications of combining terminal detection capability and cloud computing capability by using the internet also appear. Intelligent terminals such as intelligent wrist-watch, intelligent bracelet have added the function of measuring various physiological parameters. Among them, a nondestructive measurement technique, for example, a technique of performing nondestructive noncontact measurement based on an optical measurement technique, is widely used. Various physiological parameters related to human skin are of great use for medical diagnosis, skin care, health monitoring and the like. For example, the water content of the skin, and in particular the stratum corneum, may reflect the health status of the skin and may also be used to reflect the health status of the body. The collagen and elastin distribution of the skin can be used for precision treatment of skin tissue, for example by triggering the production of heat shock proteins to achieve skin tightening and wrinkle reduction. However, the prior art lacks means for effectively measuring the distribution of collagen and elastin in the skin, and therefore, targeted treatment of areas with severe collagen and elastin defects is not possible, and there is a risk of damage to the skin due to excessive cosmetic changes. In addition to skin moisture content and the distribution of collagen and elastin to the skin, other skin physiological parameters can be detected to provide reference information for medical diagnosis, skin care, health monitoring, and the like.

Therefore, a method, a device and an intelligent terminal for detecting skin physiological parameters are needed, which can accurately measure collagen and elastin of the skin and other skin physiological parameters.

Disclosure of Invention

In a first aspect, an embodiment of the present application provides a method for detecting a physiological parameter of skin, including: emitting, by an emitting module, light of one or more wavelengths towards a skin area under test; respectively polarizing and analyzing the light emitted by the emitting module and the light reflected by the measured skin area according to a preset modulation mode through a modulatable polarizer/analyzer group so as to obtain a plurality of polarization attributes related to the measured skin area, wherein the number of the polarization attributes and the relation among the polarization attributes are determined according to the preset modulation mode; and utilizing a data model between the measured skin physiological parameter and the polarization attribute to calculate the measured skin physiological parameter related to the measured skin area from the plurality of polarization attributes, wherein the data model is selected from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameter, and the preset modulation mode is set according to the measured skin physiological parameter so that at least one polarization attribute in the plurality of polarization attributes has higher sensitivity to the change of the measured skin physiological parameter relative to the other polarization attribute in the plurality of polarization attributes.

In the technical solution described in the first aspect, at least one of the polarization attributes has a higher sensitivity to the change of the measured skin physiological parameter than another one of the polarization attributes, which is further beneficial to improving the measurement sensitivity and measuring the change of the measured skin physiological parameter by the polarization attribute with higher sensitivity.

According to a possible implementation manner of the technical solution of the first aspect, the embodiment of the present application further provides that the measured skin physiological parameter is a collagen/elastin distribution.

According to a possible implementation manner of the technical solution of the first aspect, an embodiment of the present application further provides that the relationship among the plurality of polarization attributes includes a relative position relationship between array elements on a polarization attribute matrix composed of the plurality of polarization attributes, and the array elements of the polarization attribute matrix correspond to the plurality of polarization attributes one to one.

According to a possible implementation manner of the technical solution of the first aspect, an embodiment of the present application further provides that the relationship among the plurality of polarization attributes includes an order relationship among elements in a polarization attribute sequence composed of the plurality of polarization attributes, and the elements in the polarization attribute sequence correspond to the plurality of polarization attributes one to one.

According to a possible implementation manner of the technical solution of the first aspect, the embodiment of the present application further provides that the measured skin physiological parameter is distribution of collagen/elastin, the polarization attribute matrix is a square matrix with 4 rows and 4 columns, a sub-square matrix with 2 rows and 2 columns is located at the center of the square matrix, and polarization attributes corresponding to array elements in the sub-square matrix have higher sensitivity to changes of the measured skin physiological parameter than polarization attributes corresponding to array elements not in the sub-square matrix.

According to a possible implementation manner of the technical solution of the first aspect, the embodiment of the present application further provides that the measured skin physiological parameter is a distribution of collagen/elastin, the polarization attribute sequence includes 16 elements, and polarization attributes corresponding to 4 elements arranged in series in the 16 elements have higher sensitivity to a change of the measured skin physiological parameter relative to polarization attributes corresponding to other elements of the polarization attribute sequence.

According to a possible implementation manner of the technical solution of the first aspect, an embodiment of the present application further provides that the modulatable polarizer/analyzer set includes a plurality of polarizers and a plurality of analyzers, where, according to the modulatable polarizer/analyzer set and the preset modulation mode, polarization and analysis are respectively performed on the light emitted by the emission module and the light reflected by the skin region to be tested, including: adjusting the angle between the polaroid and the quarter-wave plate of each of the plurality of polarizers according to the preset modulation mode so as to generate a plurality of polarization channels, and adjusting the angle between the polaroid and the quarter-wave plate of each of the plurality of analyzers according to the preset modulation mode so as to generate a plurality of polarization analysis channels, wherein the matching between the plurality of polarization analysis channels and the plurality of polarization analysis channels is determined according to the preset modulation mode, and the quantity of the plurality of polarization attributes is determined according to the matching between the plurality of polarization analysis channels and the plurality of polarization analysis channels.

According to a possible implementation manner of the technical solution of the first aspect, an embodiment of the present application further provides that the light emitted by the emission module includes a first wavelength and a second wavelength, where the first wavelength is in a near-infrared light band, and the second wavelength is in a green light band, where the light emitted by the emission module and the light reflected by the skin region to be measured are respectively polarized and analyzed by the tunable polarizer/analyzer set according to the preset modulation mode, so as to obtain a plurality of polarization attributes related to the skin region to be measured, including: respectively polarizing and analyzing the light with the first wavelength emitted by the emitting module and the light with the first wavelength emitted by the emitting module reflected by the skin area to be detected according to the preset modulation mode through the modulatable polarizer/analyzer group so as to obtain a plurality of first polarization attributes related to the skin area to be detected; and polarizing and analyzing the light with the second wavelength emitted by the emission module and the light with the second wavelength emitted by the emission module reflected by the skin area to be detected respectively through the modulatable polarizer/analyzer group according to the preset modulation mode, so as to obtain a plurality of second polarization attributes related to the skin area to be detected.

According to a possible implementation manner of the technical solution of the first aspect, an embodiment of the present application further provides that the plurality of first polarization attributes are used to calculate an intermediate parameter of the measured skin area at a first penetration depth, the plurality of second polarization attributes are used to calculate an intermediate parameter of the measured skin area at a second penetration depth, the first penetration depth is greater than the second penetration depth, and the intermediate parameter of the measured skin area at the first penetration depth and the intermediate parameter of the measured skin area at the second penetration depth are used to calculate the measured skin physiological parameter.

According to a possible implementation manner of the technical solution of the first aspect, the embodiment of the present application further provides that the light emitted by the emitting module includes light having a first code and a second code at the same wavelength, and polarization attributes corresponding to the first coded light and the second coded light are demodulated and then used to calculate the physiological parameter of the skin to be measured.

In a second aspect, embodiments of the present application provide a non-transitory computer-readable storage medium that stores computer instructions. The computer instructions, when executed by a processing apparatus, cause the processing apparatus to perform the method according to any one of the first aspects.

In the technical solution described in the second aspect, at least one of the polarization attributes has a higher sensitivity to the change of the measured skin physiological parameter than another of the polarization attributes, which is further beneficial to improving the measurement sensitivity and measuring the change of the measured skin physiological parameter through the polarization attribute with higher sensitivity.

In a third aspect, an embodiment of the present application provides an apparatus for detecting a physiological parameter of skin, the apparatus including: the emitting module is used for emitting light with one or more wavelengths towards the skin area to be measured; the modulatable polarizer/analyzer set is used for respectively polarizing and analyzing the light emitted by the emitting module and the light reflected by the measured skin area according to a preset modulation mode so as to obtain a plurality of polarization attributes related to the measured skin area, wherein the number of the polarization attributes and the relation among the polarization attributes are determined according to the preset modulation mode; and a physiological parameter calculation module for calculating a measured skin physiological parameter related to the measured skin region from the plurality of polarization attributes by using a data model between the measured skin physiological parameter and the polarization attributes, wherein the data model is selected from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameter, wherein the preset modulation mode is set according to the measured skin physiological parameter so that at least one polarization attribute of the plurality of polarization attributes has higher sensitivity to a change of the measured skin physiological parameter relative to another polarization attribute of the plurality of polarization attributes, and the measured skin physiological parameter is a collagen/elastin distribution.

In the technical solution described in the third aspect, at least one of the polarization attributes has a higher sensitivity to the change of the measured skin physiological parameter than another of the polarization attributes, which is further beneficial to improving the measurement sensitivity and measuring the change of the measured skin physiological parameter by the polarization attribute with higher sensitivity.

According to a possible implementation manner of the technical solution of the third aspect, the embodiment of the present application further provides that the relationship among the plurality of polarization attributes includes a relative position relationship between array elements on a polarization attribute matrix composed of the plurality of polarization attributes, the array elements of the polarization attribute matrix correspond to the plurality of polarization attributes one to one, the polarization attribute matrix is a square matrix with 4 rows and 4 columns, a sub-square matrix with 2 rows and 2 columns is located at the center of the square matrix, and the polarization attribute corresponding to the array element in the sub-square matrix has a higher sensitivity to the change of the measured skin physiological parameter than the polarization attribute corresponding to the array element not in the sub-square matrix.

According to a possible implementation manner of the technical solution of the third aspect, an embodiment of the present application further provides that the relationship among the plurality of polarization attributes includes an order relationship among elements in a polarization attribute sequence composed of the plurality of polarization attributes, the elements of the polarization attribute sequence correspond to the plurality of polarization attributes one to one, the polarization attribute sequence includes 16 elements, and the polarization attribute corresponding to 4 elements arranged in succession among the 16 elements has a higher sensitivity to a change of the measured skin physiological parameter than the polarization attribute corresponding to other elements of the polarization attribute sequence.

According to a possible implementation manner of the technical solution of the third aspect, an embodiment of the present application further provides that the modulatable polarizer/analyzer set includes a plurality of polarizers and a plurality of analyzers, where the modulatable polarizer/analyzer set respectively polarizes and analyzes the light emitted by the emission module and the light reflected by the skin region under test according to the preset modulation mode, and the polarization analysis includes: adjusting the angle between the polaroid and the quarter-wave plate of each of the plurality of polarizers according to the preset modulation mode so as to generate a plurality of polarization channels, and adjusting the angle between the polaroid and the quarter-wave plate of each of the plurality of analyzers according to the preset modulation mode so as to generate a plurality of polarization analysis channels, wherein the matching between the plurality of polarization analysis channels and the plurality of polarization analysis channels is determined according to the preset modulation mode, and the quantity of the plurality of polarization attributes is determined according to the matching between the plurality of polarization analysis channels and the plurality of polarization analysis channels.

According to a possible implementation manner of the technical solution of the third aspect, an embodiment of the present application further provides that the light emitted by the emission module includes a first wavelength and a second wavelength, where the first wavelength is in a near-infrared light band, and the second wavelength is in a green light band, where the polarizing and analyzing performed by the tunable polarizer/analyzer set on the light emitted by the emission module and the light reflected by the skin region to be measured according to the preset modulation mode respectively to obtain a plurality of polarization attributes related to the skin region to be measured, including: respectively polarizing and analyzing the light with the first wavelength emitted by the emitting module and the light with the first wavelength emitted by the emitting module reflected by the skin area to be detected according to the preset modulation mode through the modulatable polarizer/analyzer group so as to obtain a plurality of first polarization attributes related to the skin area to be detected; and polarizing and analyzing the light with the second wavelength emitted by the emission module and the light with the second wavelength emitted by the emission module reflected by the skin area to be detected respectively through the modulatable polarizer/analyzer group according to the preset modulation mode, so as to obtain a plurality of second polarization attributes related to the skin area to be detected.

According to a possible implementation manner of the technical solution of the third aspect, the embodiment of the present application further provides that the plurality of first polarization attributes are used to calculate an intermediate parameter of the measured skin area at a first penetration depth, the plurality of second polarization attributes are used to calculate an intermediate parameter of the measured skin area at a second penetration depth, the first penetration depth is greater than the second penetration depth, and the intermediate parameter of the measured skin area at the first penetration depth and the intermediate parameter of the measured skin area at the second penetration depth are used to calculate the measured skin physiological parameter.

According to a possible implementation manner of the technical solution of the third aspect, the embodiment of the present application further provides that the light emitted by the emitting module includes light having a first code and a second code at the same wavelength, and polarization attributes corresponding to the first coded light and the second coded light are demodulated and then used to calculate the physiological parameter of the measured skin.

Drawings

In order to explain the technical solutions in the embodiments or background art of the present application, the drawings used in the embodiments or background art of the present application will be described below.

Fig. 1 shows a schematic flow chart of a method for detecting a skin physiological parameter provided in an embodiment of the present application.

Fig. 2 shows a block diagram of an apparatus for detecting skin physiological parameters provided by an embodiment of the present application.

Fig. 3 shows a schematic diagram of an intelligent terminal provided in an embodiment of the present application for detecting a skin physiological parameter.

Detailed Description

In order to solve the technical problem that a means for effectively measuring the distribution of collagen and elastin of the skin is lacked in the prior art, the embodiment of the application provides a method and a device for detecting skin physiological parameters and an intelligent terminal. In this way, it is achieved that collagen and elastin as well as other skin physiological parameters of the skin can be accurately measured.

The embodiment of the application can be used in the following application scenarios including, but not limited to, medical diagnosis, skin care, health monitoring, or any application scenario in which reference information can be obtained by detecting skin physiological parameters.

The embodiments of the present application may be modified and improved according to specific application environments, and are not limited herein.

In order to make the technical field of the present application better understand, embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a method for detecting a physiological parameter of skin according to an embodiment of the present disclosure. It is understood that collagen and elastin, or collagen fibers and elastin fibers, are the major components of the dermal layer of the skin, and are present in an amount of about 70%. Wherein the network of collagen fibers provides the skin with elastic properties. A large amount of water is distributed among the collagen fibers, and the water plays a key role in the water locking function and the water storage function of the skin and keeping the skin compact and plump. The collagen fibers can provide nutrients required for the regeneration of the skin, so that the self-repairing of the skin is promoted, and the collagen fibers can provide strong support for the dermis layer of the skin, so that the influence of skin color spots and sunburn is relieved, and the skin becomes soft, moist and glossy. Generally, collagen fibers in the skin are naturally lost from the age of 18 years, perhaps at a rate of 1.5% per year from the age of 25 years, and by the age of 45 years the amount of collagen fibers lost is about 30%. With age, skin naturally ages, during which collagen/elastin gradually degrades or fragments until it disappears. Heating the skin tissue, for example, the dermis layer to 46 degrees for more than 3 minutes, can trigger the skin to produce heat shock proteins, thereby inducing the skin to produce new collagen/elastin. The collagen/elastin defects in various areas of the skin are different, and therefore, a targeted therapy is required, and particularly, the heating mode of the skin tissue needs to be adjusted according to the specific defect, such as optical, ultrasonic or radio frequency heating. For this reason, a method for detecting physiological parameters of the skin is required, which can accurately measure collagen and elastin of the skin. Since collagen fibers and elastin fibers are mainly present in the dermis layer of the skin in a columnar form, and these two fibers shrink or break when the skin ages, the columnar arrangement itself changes. Therefore, the change of the microstructure in the dermal layer of the skin macroscopically caused by the atrophy, breakage and arrangement change of the collagen fibers/elastin fibers in the skin aging process can be utilized to calculate the distribution of the collagen fibers/elastin fibers, and the distribution can be used as reference information to judge the defect condition of the collagen/elastin. In addition, other skin physiological parameters may also cause microscopic structural changes in the skin on a macroscopic scale. This is explained in detail below with reference to fig. 1. As shown in fig. 1, the method 100 includes the following steps.

Step S102: light of one or more wavelengths is emitted towards the skin area under test by the emitting module.

Any suitable light source may be used to generate illumination light of a particular wavelength, such as visible light, near infrared, and far infrared, among others. The emission module may further include a collimating lens for collimating. The emitting module may emit light of different wavelengths to provide better measurement results in combination with subsequent operations, as will be described in more detail below.

Step S104: and respectively polarizing and analyzing the light emitted by the emitting module and the light reflected by the skin area to be detected according to a preset modulation mode through a modulatable polarizer/analyzer group so as to obtain a plurality of polarization attributes related to the skin area to be detected.

And determining the quantity of the plurality of polarization attributes and the relation among the plurality of polarization attributes according to the preset modulation mode. After being collimated by the collimating lens, light emitted by the emitting module is modulated into different polarization states according to a preset modulation mode through the emitting end of the modulatable polarizer/analyzer group, the light in different polarization states is reflected by the skin area to be detected (including skin reflected light and internally emitted backward scattered light, which is herein collectively understood as light reflected by the skin area to be detected), the light in different polarization states changes in polarization state due to the microstructure of the skin area to be detected, and is imaged through the detecting end of the modulatable polarizer/analyzer group, so that a plurality of polarization attributes related to the skin area to be detected can be obtained. In other words, the polarization characteristics of the incident light and the polarization characteristics of the light reflected from the target site are compared by the polarization analyzing means after modulation, and the distribution of the collagen fibers and the elastic fibers in the target site is determined. This is because the collagen fiber/elastin fiber distribution in the skin region under test is columnar and affects the microstructure of the skin region under test, and the change in these microstructures is reflected in the difference between the polarization characteristic of the incident light and the polarization characteristic of the light reflected from the target site, so that the information about the microstructure of the skin region under test can be obtained by the above-mentioned tunable polarizer/analyzer set and according to the preset modulation mode, and the collagen fiber/elastin fiber distribution can be deduced. More specifically, the light emitted by the emitting module is collimated and then passes through the emitting end of the modulatable polarizer/analyzer set to be modulated into different polarization states according to a preset modulation mode, so that the obtained incident light with different polarization states enters the skin area to be detected and undergoes multiple scattering when being transmitted, and the change of the photon polarization state in the scattering process is closely related to the microstructure of the scattering medium (namely the columnar distribution of collagen fibers/elastin fibers in the dermis of the skin), so that the polarization state of the scattered light can be measured by a polarization analyzing means after modulation, and the information of the microstructure can be obtained. The detection end of the modulatable polarizer/analyzer set receives both the skin-reflected light and the internally emitted backscattered light, collectively understood herein as light reflected via the skin region under test.

In order to obtain information on a specific microstructure, particularly the distribution of collagen fibers/elastin fibers, better, it is necessary to use a polarization analysis means after modulation and a predetermined modulation pattern. Specifically, a beam of collimated light passes through the transmitting end of the modulatable polarizer/analyzer set to obtain completely polarized light with a specific polarization state, which is also called as polarized light, and the signal transmitted after the polarized light irradiates the skin and undergoes the processes of scattering, absorption, reflection and the like is detected at the detecting end of the modulatable polarizer/analyzer set to obtain the polarized light. The information of the distribution of the collagen fibers/the elastin fibers can be extracted by analyzing and comparing the polarization light and the polarization detection light or the electric signals corresponding to the polarization light and the polarization detection light through a specific algorithm. Here, there may be various combinations of polarization directions between the polarizing and detecting lights, or there may be various combinations of changes in polarization directions of the detecting lights with respect to the polarizing of the polarizing lights, so that it is possible to set different polarization directions to obtain more abundant information. In one possible embodiment, the angle between the polarizer and the quarter-wave plate of each of the plurality of polarizers is adjusted according to the preset modulation mode to generate a plurality of polarization channels, and the angle between the polarizer and the quarter-wave plate of each of the plurality of analyzers is adjusted according to the preset modulation mode to generate a plurality of polarization analysis channels; and the number of the polarization properties is determined according to the matching between the polarization channels and the polarization detection channels. For example, the transmitting end of the modulatable polarizer/analyzer set may be made to have polarizing plates with polarization directions of 0 degrees, 45 degrees and 95 degrees for polarization, respectively, and then the detecting end of the modulatable polarizer/analyzer set may be made to detect the polarization and the light intensity value by the polarization camera. It should be understood that the transmitting end of the tunable polarizer/analyzer set may use a combination of a polarizer and a quarter-wave plate to generate various fully polarized lights, including linearly polarized light, circularly polarized light and elliptically polarized light, and the handedness of the circularly polarized light and the elliptically polarized light may be arbitrarily adjusted, and the directions of the linearly polarized light and the elliptically polarized light may be arbitrarily adjusted. The transmitting end of the modulatable polarizer/analyzer set can also adopt any suitable device or combination for polarization. The detection end of the modulatable polarizer/analyzer group can adopt the combination of a polarizing plate and a quarter-wave plate to analyze, and various analyzing channels can be generated by adjusting the angles of the polarizing plate and the quarter-wave plate, wherein the various analyzing channels comprise a linearly polarized light analyzing channel, a circularly polarized light analyzing channel and an elliptically polarized light analyzing channel. The detection end of the modulatable polarizer/analyzer set can also adopt a combination of a quarter-wave plate and a polarization camera to analyze the polarization. And a polarizer in a specific direction is arranged in front of each pixel of the polarization camera, so that various polarization detection channels can be generated by adjusting the angle of the quarter-wave plate after the quarter-wave plate is arranged in front of the polarization camera, wherein the polarization detection channels comprise a linearly polarized light polarization detection channel, a circularly polarized light polarization detection channel and an elliptically polarized light polarization detection channel. Because the polarization camera has four polarizers with different polarization directions, four polarization detection channels can be obtained by rotating the quarter-wave plate once. The detection end of the modulatable polarizer/analyzer group can also adopt any device or combination with proper polarization analysis function.

As described above, the matching between the polarization channels and the polarization analysis channels is determined according to the preset modulation mode, and the number of the polarization attributes and the relationship between the polarization attributes are determined according to the preset modulation mode. That is, the preset modulation mode determines the specific modulation mode of the modulatable polarizer/analyzer set, including the specific modulation mode of the transmitting terminal of the modulatable polarizer/analyzer set and the specific modulation mode of the detecting terminal of the modulatable polarizer/analyzer set. The light emitted by the emitting module is collimated and then passes through a plurality of polarizers at the emitting end of the modulatable polarizer/analyzer group to obtain a plurality of polarized light, and then passes through a plurality of analyzers at the detecting end of the modulatable polarizer/analyzer group to obtain a plurality of polarized light. Thus, matching between polarization and analyzer modulations, as well as various combinations, can be used to derive a plurality of polarization properties associated with the measured skin region. Furthermore, the matching between the plurality of polarization channels and the plurality of polarization detection channels is determined according to the preset modulation mode, and the number of the plurality of polarization properties is determined according to the matching between the plurality of polarization channels and the plurality of polarization detection channels. In other words, the specific modulation mode of the modulatable polarizer/analyzer set can be adjusted by setting a preset modulation mode, and the matching between the plurality of polarization channels and the plurality of analyzer channels, that is, the matching between the polarization modulation and the analyzer modulation, is determined, so as to determine the number of the plurality of polarization attributes. The plurality of polarization properties may be understood as a set of physical parameters that can be used to obtain information on the microstructure of the illuminated target site, i.e. the measured skin area. The plurality of polarization properties correspond to a set of physical parameters, or each polarization property may be understood as one physical parameter. The physical meaning of these physical parameters, corresponding to the polarization properties, is determined by the preset modulation mode. It should be appreciated that the preset modulation mode is set according to the measured skin physiological parameter, so that at least one of the polarization attributes has higher sensitivity to the change of the measured skin physiological parameter relative to another one of the polarization attributes. This means that the preset modulation mode may be set according to the distribution of the measured skin physiological parameter, such as collagen/elastin, so that at least one of the plurality of polarization properties has a higher sensitivity to a change of the measured skin physiological parameter than another of the plurality of polarization properties, thereby facilitating an increase of the sensitivity of the measurement and a measurement of the change of the measured skin physiological parameter by the higher sensitivity polarization properties, which will be described in detail below.

In a possible implementation manner, the relationship between the plurality of polarization attributes includes a relative position relationship between the array elements on a polarization attribute matrix composed of the plurality of polarization attributes, and the array elements of the polarization attribute matrix correspond to the plurality of polarization attributes one to one. Here, the set of physical parameters corresponding to the plurality of polarization properties is expressed in the form of a polarization property matrix. And, a polarization property matrix including a plurality of polarization properties can be deduced by matrix operation between the modulation matrix of the polarizer and the modulation matrix of the analyzer. The polarization property matrix obtained in this way can transform the physical parameters corresponding to the polarization properties of the array elements in the matrix into parameters with a more definite physical significance by using techniques such as matrix decomposition or matrix transformation, and can be used for characterizing the damage and distribution of collagen fibers/elastin fibers of the irradiated target region, i.e., the skin region to be measured. In some exemplary embodiments, assuming that the measured skin physiological parameter is collagen/elastin distribution, the polarization property matrix is a 4-row-4-column square matrix, and a 2-row-2-column sub-square matrix is located at the center of the square matrix, and the polarization properties corresponding to the array elements in the sub-square matrix have higher sensitivity to changes in the measured skin physiological parameter than the polarization properties corresponding to the array elements not in the sub-square matrix. Here, the polarization property matrix is a square matrix of 4 rows and 4 columns, that is, there are 16 array elements, which means that 16 measurements under matching between the polarization-originating modulation and the polarization-analyzing modulation are required. This can be achieved by matching the polarization channels to the analyzer channels as described above, for example by matching 4 different types of polarization channels to 4 different types of analyzer channels to achieve a total of 16 measurements, and then for example by acquiring 16 polarization images with a detector such as a polarization camera, and then for example by a combination of a quarter-wave plate and a polarization camera (for example, a polarization camera has four polarizers with different polarization directions, a quarter-wave plate can acquire four analyzer channels with one rotation and rotate twice and a polarization camera acquires eight polarization pictures with one rotation). It should be understood that any suitable specific modulation scheme for the modulatable polarizer/analyzer set may be used to obtain the polarization property matrix of the 4-row and 4-column square matrix described above, i.e., to achieve 16 measurements under matching between polarization modulation and analyzer modulation. In summary, by setting a specific modulation mode of the modulatable polarizer/analyzer set and by setting a specific implementation form of the appropriate modulatable polarizer/analyzer set, a polarization attribute matrix composed of the plurality of polarization attributes can be obtained, and the relationship among the plurality of polarization attributes includes a relative position relationship among array elements on the polarization attribute matrix composed of the plurality of polarization attributes.

In a possible implementation manner, the polarization attribute matrix composed of the plurality of polarization attributes, wherein a sub-matrix of 2 rows and 2 columns is located at the center of the square matrix, and the polarization attributes corresponding to the array elements in the sub-matrix have higher sensitivity to the change of the measured skin physiological parameter than the polarization attributes corresponding to the array elements not in the sub-matrix. This means that the variation of the measured skin physiological parameter can be better measured by the polarization property corresponding to the array element in the sub-square matrix. And, the measurement under the matching between the polarization modulation and the polarization analysis modulation can be simplified by using this point, that is, only the specific modulation mode of the modulatable polarizer/analyzer group needs to be set so as to obtain the polarization property corresponding to the array element in the sub-square array by the measurement, so that the total number of measurement times of 16 times is reduced to the number of measurement times of nine times, because the total number of measurement times of nine times is needed to obtain the complete polarization information of the 2 rows and 2 columns of sub-square array. And if the measured skin physiological parameter is the distribution of collagen/elastin, the polarization attribute corresponding to the sub-square array elements of 2 rows and 2 columns at the center of the square array has higher sensitivity. When the physiological parameter of the skin to be detected is water, the polarization properties corresponding to different array elements have higher sensitivity. For convenience of description, it is assumed that the above-mentioned 4 rows and 4 columns of square matrix is denoted as M (i, j), where i denotes the several rows and j denotes the several columns, so i goes through from 1 to 4 and j goes through from 1 to 4. A sub-square array of 2 rows and 2 columns means four array elements, M (2, 2), M (2, 3), M (3, 2) and M (3, 3), respectively. The polarization properties corresponding to the four array elements have high sensitivity to changes in the collagen/elastin distribution. Similarly, when the measured skin physiological parameter is moisture, the polarization properties corresponding to the three array elements of M (2, 2), M (3, 3) and M (4, 4) have higher sensitivity to moisture changes. Thus, the sensitivity of different elements in the polarization attribute matrix composed of the plurality of polarization attributes to the change of the physiological parameter of the skin to be measured can be used to improve the measurement effect of the specific physiological parameter. For example, the preset modulation mode may be set according to the distribution of the measured skin physiological parameter, such as collagen/elastin, so that at least one of the polarization attributes has a higher sensitivity to a change of the measured skin physiological parameter than another one of the polarization attributes, thereby facilitating an improvement of the sensitivity of the measurement and a measurement of the change of the measured skin physiological parameter by the polarization attribute with higher sensitivity. The polarization attribute matrix composed of the plurality of polarization attributes may extract more information related to the measured skin physiological parameter through matrix decomposition, matrix transformation, and the like, and may obtain the degree of anisotropy through a specific algorithm, for example, to reflect the content of collagen fibers, and the like.

In a possible implementation, the relationship between the plurality of polarization attributes includes an order relationship between elements on a polarization attribute sequence composed of the plurality of polarization attributes, and the elements of the polarization attribute sequence are in one-to-one correspondence with the plurality of polarization attributes. Here, the set of physical parameters corresponding to the plurality of polarization properties is expressed in the form of a sequence of polarization properties. Information related to the measured skin physiological parameter can be better extracted by this transformation, in a similar manner to that described above for the polarization attribute matrix. In some exemplary embodiments, if the measured skin physiological parameter is distribution of collagen/elastin, the polarization attribute sequence includes 16 elements, and polarization attributes corresponding to 4 elements arranged in series in the 16 elements have higher sensitivity to changes of the measured skin physiological parameter than polarization attributes corresponding to other elements of the polarization attribute sequence. Here, similarly to the case where the polarization property matrix is a 4-row and 4-column square matrix as described above, in order to realize the measurement 16 times under the matching between the polarization modulation and the polarization analysis modulation, any suitable specific modulation method of the modulatable polarizer/analyzer set may be adopted. The 4 elements arranged in series correspond to four array elements of the 2 rows and 2 columns of the sub-square array, which are M (2, 2), M (2, 3), M (3, 2) and M (3, 3). The polarization properties corresponding to these 4 elements have a higher sensitivity to changes in the collagen/elastin distribution. And, the preset modulation mode may be set according to the distribution of the measured skin physiological parameter, such as collagen/elastin, so that at least one of the polarization attributes has a higher sensitivity to the change of the measured skin physiological parameter than another one of the polarization attributes, thereby facilitating to improve the sensitivity of measurement and measure the change of the measured skin physiological parameter through the polarization attribute with higher sensitivity. And, the polarization attribute sequence composed of the plurality of polarization attributes can be used for extracting more information related to the measured skin physiological parameter by any suitable algorithm and mathematical tool. As further illustrated below in connection with table 1.

TABLE 1

Normalized values of polarization attribute matrix array elements under different collagen/elastin distributions	M11	M12	M22	M23	M32	M33	M41	M44
									Distribution 1 (collagen sufficiency)	1.0	0.05	0.5	0.1	0.1	0.7	0.01	0.15
Distribution 2 (collagen severely damaged)	1.0	0.01	0.2	0.02	0.06	0.3	0.005	0.05

Referring to table 1, as described above, the polarization attribute matrix is composed of the plurality of polarization attributes, wherein a sub-matrix of 2 rows and 2 columns is located at the center of the square matrix, and the polarization attributes corresponding to the array elements in the sub-matrix have higher sensitivity to the change of the measured skin physiological parameter than the polarization attributes corresponding to the array elements not in the sub-matrix. For convenience of description, it is assumed that the above-mentioned 4 rows and 4 columns of square matrix is denoted as M (i, j), where i denotes the several rows and j denotes the several columns, so i goes through from 1 to 4 and j goes through from 1 to 4. A sub-square array of 2 rows and 2 columns means four array elements, M (2, 2), M (2, 3), M (3, 2) and M (3, 3), respectively. The polarization properties corresponding to the four array elements have high sensitivity to changes in the collagen/elastin distribution. Similarly, the 4 elements arranged in series correspond to four array elements of a 2-row and 2-column sub-square matrix, which are M (2, 2), M (2, 3), M (3, 2) and M (3, 3). The polarization properties corresponding to these 4 elements have a higher sensitivity to changes in the collagen/elastin distribution. In table 1, M22, M23, M32, and M33 denote four elements of a 2-row 2-column sub square matrix, respectively. The normalized values of each of the plurality of polarization properties in two different states of sufficient collagen (corresponding to distribution 1) and severely damaged collagen (corresponding to distribution 2) are exemplarily given in table 1. Wherein, M11 is set as 1.0 for normalization, and other polarization attributes are normalized by using M11 as a reference. It can be seen that when the collagen/elastin distribution changes from collagen-rich (corresponding to distribution 1) to collagen-severely damaged (corresponding to distribution 2), the polarization properties M22, M23, M32 and M33 change more than the other polarization properties, which means a higher sensitivity to changes in the physiological parameters of the skin being measured. For example, M22 decreased from 0.5 to 0.2 by a factor of 60%, while M12 decreased from 0.05 to 0.01 by a factor of about 80%. Therefore, the preset modulation mode is set according to the measured skin physiological parameter, so that at least one polarization attribute (for example, M22 in table 1) in the plurality of polarization attributes has higher sensitivity to the change of the measured skin physiological parameter relative to another polarization attribute (for example, M12 in table 1) in the plurality of polarization attributes, thereby being beneficial to improving the measurement sensitivity and measuring the change of the measured skin physiological parameter through the polarization attribute with higher sensitivity.

In one possible embodiment, multiple wavelengths of incident light may be utilized to further enhance the measurement effect. Wherein the light emitted by the emitting module includes a first wavelength and a second wavelength, wherein the first wavelength is in a near-infrared light band, and the second wavelength is in a green light band, and wherein the light emitted by the emitting module and the light reflected by the skin region to be tested are polarized and analyzed by the tunable polarizer/analyzer set according to the preset modulation mode, so as to obtain a plurality of polarization attributes related to the skin region to be tested, including: respectively polarizing and analyzing the light with the first wavelength emitted by the emitting module and the light with the first wavelength emitted by the emitting module reflected by the skin area to be detected according to the preset modulation mode through the modulatable polarizer/analyzer group so as to obtain a plurality of first polarization attributes related to the skin area to be detected; and polarizing and analyzing the light with the second wavelength emitted by the emission module and the light with the second wavelength emitted by the emission module reflected by the skin area to be detected respectively through the modulatable polarizer/analyzer group according to the preset modulation mode, so as to obtain a plurality of second polarization attributes related to the skin area to be detected. Thus, the obtained polarization properties are divided into two categories, a first plurality of polarization properties associated with the measured skin area and a second plurality of polarization properties associated with the measured skin area. Since light of different wavelengths has different penetration depths, information of microstructures at different penetration depths can also be reflected. Specifically, the plurality of first polarization attributes are used for calculating an intermediate parameter of the measured skin area at a first penetration depth, the plurality of second polarization attributes are used for calculating an intermediate parameter of the measured skin area at a second penetration depth, the first penetration depth is greater than the second penetration depth, and the intermediate parameter of the measured skin area at the first penetration depth and the intermediate parameter of the measured skin area at the second penetration depth are used for calculating the measured skin physiological parameter. For example, near infrared light such as 810 nm (nanometer, nm) and green light such as 532nm are respectively incident on the skin, wherein the penetration depth of the red light is larger than that of the green light. It should be understood that the polarization properties obtained by the light of different wavelengths can be understood as intermediate parameters, and the processing of the respective intermediate parameters of the light of different wavelengths can be used to improve the measurement effect. For example, subtraction can be performed on these intermediate parameters to obtain information on the microstructure of different layers, i.e. different penetration depths. For another example, polarization images of two wavelengths (such as orthogonal polarization images) may be obtained separately, and then the polarization images of two wavelengths are subtracted, so as to extract information of skin tissue at a deeper position. This is because collagen and elastin are both distributed in the dermis, which is deeper in the skin, and the specificity of collagen and elastin measurement can be improved by combining the polarization properties with the multi-wavelength incident light described above.

In a possible embodiment, the measurement effect can also be improved by encoding light of a single wavelength. The light emitted by the emitting module comprises light with a first code and a second code under the same wavelength, and polarization attributes corresponding to the first coded light and the second coded light are demodulated and then used for calculating the physiological parameters of the skin to be measured. Specifically, light of a horizontal polarization state with an incident frequency of a first frequency, light of a 45-degree polarization state with an incident frequency of a second frequency, and light of a 90-degree polarization state with an incident frequency of a third frequency may be used, and then the light of these polarization states may be simultaneously received with a polarization camera. Because the incident frequencies of the incident lights in different polarization states are different, the incident lights can be demodulated in a later signal processing mode, so that a plurality of polarization attributes are inversely solved, and a polarization attribute matrix formed by the plurality of polarization attributes is deduced, so that the overall measurement time is reduced, the influence of interference and noise is reduced, and the measurement accuracy is improved.

Step S106: and calculating the measured skin physiological parameter related to the measured skin area from the plurality of polarization attributes by using a data model between the measured skin physiological parameter and the polarization attributes.

And selecting the data model from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameter. In step S104, it is mentioned that the light emitted by the emitting module and the light reflected by the skin region under test are polarized and analyzed respectively according to a preset modulation mode by a modulatable polarizer/analyzer set, so as to obtain a plurality of polarization attributes related to the skin region under test. The physical significance of the set of physical parameters corresponding to the polarization attributes can be quickly judged by means of pre-storing data models in a data model base. Therefore, the pre-stored data model base can store data models between the measured skin physiological parameters and the polarization attributes, so that the measured skin physiological parameters related to the measured skin area can be rapidly judged according to a plurality of polarization attributes obtained through measurement. And, as described above, the preset modulation mode is set according to the measured skin physiological parameter such that at least one of the plurality of polarization properties has a higher sensitivity to a change in the measured skin physiological parameter relative to another of the plurality of polarization properties. Therefore, the data model in the pre-stored data model library also embodies the improvement of the measurement sensitivity and the measurement of the change of the measured skin physiological parameter through the polarization property with higher sensitivity. In some exemplary embodiments, a reference system may be established to reflect the relationship between the measured skin physiological parameter and the polarization property by measuring the polarization property of the skin sample under different physiological parameters of the skin sample, such as different collagen/elastin distributions, and may be further used to establish a pre-stored database or update a model in the pre-stored database. Thus, since the preset modulation pattern is set according to the measured skin physiological parameter, a preset modulation pattern with better performance on the measured skin physiological parameter and a corresponding data model, such as a polarization property more sensitive to a change in collagen/elastin distribution with reference to table 1, can be selected, so that the measurement effect can be improved.

In a possible implementation manner, the pre-stored data model base may be stored locally, or may be at a cloud end or a server end, and the polarization attribute is obtained by a local detector in a manner of combining a terminal with the cloud end, and then the corresponding data model is obtained by the database at the cloud end.

Referring to fig. 2, fig. 2 is a block diagram illustrating a structure of an apparatus for detecting a skin physiological parameter according to an embodiment of the present application. As shown in fig. 2, the apparatus 200 includes a transmitting module 202, a modulatable polarizer/analyzer set 204, a physiological parameter calculation module 206, and a data model interface 208. The emitting module 202 is configured to emit light of one or more wavelengths toward the skin area to be measured. The modulatable polarizer/analyzer group 204 is configured to perform polarization and analysis on the light emitted by the emitting module 202 and the light reflected by the skin region to be measured respectively according to a preset modulation mode, so as to obtain a plurality of polarization attributes related to the skin region to be measured; and determining the quantity of the plurality of polarization attributes and the relation among the plurality of polarization attributes according to the preset modulation mode. The physiological parameter calculation module 206 is configured to calculate a measured skin physiological parameter associated with the measured skin region from the plurality of polarization attributes by using a data model between the measured skin physiological parameter and the polarization attributes. And selecting the data model from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameter. And the preset modulation mode is set according to the measured skin physiological parameter so that at least one polarization attribute in the plurality of polarization attributes has higher sensitivity to the change of the measured skin physiological parameter relative to another polarization attribute in the plurality of polarization attributes. The data model interface 208 is used for obtaining the data model, that is, selecting a corresponding data model from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameter. The pre-stored data model base can be stored locally, or can be at a cloud end or a server end, the polarization attribute is obtained by a local detector in a mode of combining a terminal with the cloud end, and then the corresponding data model is obtained through the database at the cloud end. Thus, the data model interface 208 may be coupled to local or nearby memory, or to a cloud or server database via a suitable communication means such as the internet. The functions and operation principles of the transmitting module 202, the modulatable polarizer/analyzer group 204, and the physiological parameter calculating module 206 may refer to step S102, step S104, and step S106 of the method 100 shown in fig. 1, which are not described herein again. It should be understood that the device 200 may be used when the measured skin physiological parameter is collagen/elastin distribution. Therefore, the apparatus 200 may set the preset modulation mode according to the distribution of the measured skin physiological parameter, such as collagen/elastin, so that at least one of the polarization attributes has a higher sensitivity to the change of the measured skin physiological parameter than another one of the polarization attributes, thereby facilitating to improve the measurement sensitivity and measure the change of the measured skin physiological parameter through the polarization attribute with higher sensitivity.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating that an intelligent terminal provided by an embodiment of the present application is used for detecting a skin physiological parameter. As shown in fig. 3, the intelligent terminal 300 includes a light source 302, a collimator 304, a modulatable polarizer/analyzer set 310, and a parameter calculation module 330. Wherein the light source 302 is configured to emit light at one or more wavelengths. The light emitted from the light source 302 is collimated by the collimator 304, then polarized by the modulatable polarizer/analyzer set 310, then irradiated to the target portion 320, then polarized by the modulatable polarizer/analyzer set 310, and then calculated by the parameter calculation module 330 to obtain the physiological parameters of the skin to be measured related to the target portion 320. The modulatable polarizer/analyzer set 310 further includes a polarizer 312 and an analyzer 314, among others. Through cooperation of the polarizer 312 and the analyzer 314, the light emitted by the light source 302 and the light reflected by the target site 320 are polarized and analyzed according to a preset modulation mode, respectively, so as to obtain a plurality of polarization properties associated with the target site 320. And determining the quantity of the plurality of polarization attributes and the relation among the plurality of polarization attributes according to the preset modulation mode. The functions and operation principles of the light source 302, the modulatable polarizer/analyzer group 310, and the parameter calculation module 330 may refer to step S102, step S104, and step S106 of the method 100 shown in fig. 1, which are not described herein again. The data model library 340 is used for providing a data model between the measured skin physiological parameter and the polarization property, that is, the data model is obtained from the data model library 340 according to the preset modulation mode and the measured skin physiological parameter. The data model base 340 may be local, or may be at a cloud end or a server end, and in a manner of combining a terminal and the cloud end, a local detector acquires the polarization attribute, and then the corresponding data model is acquired through the data model base 340 at the cloud end. It should be understood that the smart terminal 300 can be used when the measured skin physiological parameter is the distribution of collagen/elastin. Therefore, the smart terminal 300 may set the preset modulation mode according to the distribution of the measured skin physiological parameter, such as collagen/elastin, so that at least one polarization attribute of the plurality of polarization attributes has higher sensitivity to the change of the measured skin physiological parameter relative to another polarization attribute of the plurality of polarization attributes, thereby facilitating to improve the measurement sensitivity and measure the change of the measured skin physiological parameter through the polarization attribute with higher sensitivity.

The embodiments provided herein may be implemented in any one or combination of hardware, software, firmware, or solid state logic circuitry, and may be implemented in connection with signal processing, control, and/or application specific circuitry. Particular embodiments of the present application provide an apparatus or device that may include one or more processors (e.g., microprocessors, controllers, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), etc.) that process various computer-executable instructions to control the operation of the apparatus or device. Particular embodiments of the present application provide an apparatus or device that can include a system bus or data transfer system that couples the various components together. A system bus can include any of a variety of different bus structures or combination of different bus structures, such as a memory bus or memory controller, a peripheral bus, a universal serial bus, and/or a processor or local bus that utilizes any of a variety of bus architectures. The devices or apparatuses provided in the embodiments of the present application may be provided separately, or may be part of a system, or may be part of other devices or apparatuses.

Particular embodiments provided herein may include or be combined with computer-readable storage media, such as one or more storage devices capable of providing non-transitory data storage. The computer-readable storage medium/storage device may be configured to store data, programmers and/or instructions that, when executed by a processor of an apparatus or device provided by embodiments of the present application, cause the apparatus or device to perform operations associated therewith. The computer-readable storage medium/storage device may include one or more of the following features: volatile, non-volatile, dynamic, static, read/write, read-only, random access, sequential access, location addressability, file addressability, and content addressability. In one or more exemplary embodiments, the computer-readable storage medium/storage device may be integrated into a device or apparatus provided in the embodiments of the present application or belong to a common system. The computer-readable storage medium/memory device may include optical, semiconductor, and/or magnetic memory devices, etc., and may also include Random Access Memory (RAM), flash memory, read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, a hard disk, a removable disk, a recordable and/or rewriteable Compact Disc (CD), a Digital Versatile Disc (DVD), a mass storage media device, or any other form of suitable storage media.

The above is an implementation manner of the embodiments of the present application, and it should be noted that the steps in the method described in the embodiments of the present application may be sequentially adjusted, combined, and deleted according to actual needs. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. It is to be understood that the embodiments of the present application and the structures shown in the drawings are not to be construed as particularly limiting the devices or systems concerned. In other embodiments of the present application, an apparatus or system may include more or fewer components than the specific embodiments and figures, or may combine certain components, or may separate certain components, or may have a different arrangement of components. Those skilled in the art will understand that various modifications and changes may be made in the arrangement, operation, and details of the methods and apparatus described in the specific embodiments without departing from the spirit and scope of the embodiments herein; without departing from the principles of embodiments of the present application, several improvements and modifications may be made, and such improvements and modifications are also considered to be within the scope of the present application.

Claims

1. A method of detecting a physiological parameter of skin, comprising:

emitting, by an emitting module, light of one or more wavelengths towards a skin area under test;

respectively polarizing and analyzing the light emitted by the emitting module and the light reflected by the measured skin area according to a preset modulation mode through a modulatable polarizer/analyzer group so as to obtain a plurality of polarization attributes related to the measured skin area, wherein the number of the polarization attributes and the relation among the polarization attributes are determined according to the preset modulation mode; and

calculating the measured skin physiological parameters related to the measured skin area from the plurality of polarization attributes by using a data model between the measured skin physiological parameters and the polarization attributes, wherein the data model is selected from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameters,

wherein the preset modulation mode is set according to the measured skin physiological parameter such that at least one of the plurality of polarization properties has a higher sensitivity to a change in the measured skin physiological parameter relative to another one of the plurality of polarization properties,

wherein the measured skin physiological parameter is the distribution of collagen/elastin,

the light emitted by the emitting module includes a first wavelength and a second wavelength, wherein the first wavelength is in a near-infrared light band, and the second wavelength is in a green light band, and wherein the light emitted by the emitting module and the light reflected by the skin region to be measured are respectively polarized and analyzed by the set of tunable polarizer/analyzer according to the preset modulation mode, so as to obtain a plurality of polarization attributes related to the skin region to be measured, including:

respectively polarizing and analyzing the light with the first wavelength emitted by the emitting module and the light with the first wavelength emitted by the emitting module reflected by the skin area to be detected according to the preset modulation mode through the modulatable polarizer/analyzer group so as to obtain a plurality of first polarization attributes related to the skin area to be detected; and

polarizing and analyzing the light with the second wavelength emitted by the emission module and the light with the second wavelength emitted by the emission module reflected by the skin area to be measured respectively through the modulatable polarizer/analyzer group according to the preset modulation mode so as to obtain a plurality of second polarization attributes related to the skin area to be measured,

wherein the plurality of first polarization attributes are used for calculating an intermediate parameter of the measured skin area at a first penetration depth, the plurality of second polarization attributes are used for calculating an intermediate parameter of the measured skin area at a second penetration depth, the first penetration depth is greater than the second penetration depth, and the intermediate parameter of the measured skin area at the first penetration depth and the intermediate parameter of the measured skin area at the second penetration depth are used for calculating the collagen/elastin distribution.

2. The method according to claim 1, wherein the relationship between the plurality of polarization attributes comprises a relative position relationship between array elements on a polarization attribute matrix composed of the plurality of polarization attributes, and the array elements of the polarization attribute matrix are in one-to-one correspondence with the plurality of polarization attributes.

3. The method of claim 1, wherein the relationship between the plurality of polarization properties comprises an order relationship between elements on a polarization property sequence composed of the plurality of polarization properties, the elements of the polarization property sequence having a one-to-one correspondence with the plurality of polarization properties.

4. The method of claim 2, wherein the polarization attribute matrix is a square matrix with 4 rows and 4 columns, a sub-square matrix with 2 rows and 2 columns is located at the center of the square matrix, and polarization attributes corresponding to elements in the sub-square matrix have higher sensitivity to changes in the measured skin physiological parameter than polarization attributes corresponding to elements not in the sub-square matrix.

5. The method according to claim 3, wherein the polarization attribute sequence comprises 16 elements, and the polarization attributes corresponding to the 4 elements arranged in series in the 16 elements have higher sensitivity to the change of the measured skin physiological parameter relative to the polarization attributes corresponding to the other elements in the polarization attribute sequence.

6. The method of claim 1, wherein the modulatable polarizer/analyzer set comprises a plurality of polarizers and a plurality of analyzers, wherein polarizing and analyzing the light emitted by the emitting module and the light reflected by the skin region under test, respectively, according to the preset modulation pattern by the modulatable polarizer/analyzer set comprises:

adjusting the angle between the polaroid and the quarter-wave plate of each of the plurality of polarizers according to the preset modulation mode so as to generate a plurality of polarizing channels,

adjusting the angle between the polarizer and the quarter-wave plate of each of the plurality of analyzers according to the preset modulation mode to generate a plurality of analyzing channels,

and the number of the polarization properties is determined according to the matching between the polarization channels and the polarization detection channels.

7. The method of claim 1, wherein the light emitted by the emitting module includes light having a first code and a second code at the same wavelength, and polarization properties corresponding to the first code and the second code are demodulated to derive the measured skin physiological parameter.

8. A non-transitory computer readable storage medium holding computer instructions which, when executed by a processing device, cause the processing device to perform the method of any one of claims 1 to 7.

9. An apparatus for detecting a physiological parameter of skin, the apparatus comprising:

the emitting module is used for emitting light with one or more wavelengths towards the skin area to be measured;

the modulatable polarizer/analyzer set is used for respectively polarizing and analyzing the light emitted by the emitting module and the light reflected by the measured skin area according to a preset modulation mode so as to obtain a plurality of polarization attributes related to the measured skin area, wherein the number of the polarization attributes and the relation among the polarization attributes are determined according to the preset modulation mode; and

a physiological parameter calculation module for calculating a measured skin physiological parameter related to the measured skin region from the plurality of polarization attributes by using a data model between the measured skin physiological parameter and the polarization attributes, wherein the data model is selected from a pre-stored data model library according to the preset modulation mode and the measured skin physiological parameter,

the plurality of first polarization attributes are used for calculating an intermediate parameter of the measured skin area at a first penetration depth, the plurality of second polarization attributes are used for calculating an intermediate parameter of the measured skin area at a second penetration depth, the first penetration depth is larger than the second penetration depth, and the intermediate parameter of the measured skin area at the first penetration depth and the intermediate parameter of the measured skin area at the second penetration depth are used for calculating the distribution of the collagen/elastin.

10. The apparatus according to claim 9, wherein the relationship between the plurality of polarization attributes includes a relative position relationship between elements on a polarization attribute matrix composed of the plurality of polarization attributes, the elements of the polarization attribute matrix are in one-to-one correspondence with the plurality of polarization attributes, the polarization attribute matrix is a square matrix with 4 rows and 4 columns, a sub-square matrix with 2 rows and 2 columns is located at the center of the square matrix, and the polarization attributes corresponding to the elements in the sub-square matrix have higher sensitivity to the change of the measured skin physiological parameter than the polarization attributes corresponding to the elements not in the sub-square matrix.

11. The apparatus according to claim 9, wherein the relationship between the plurality of polarization attributes comprises an order relationship between elements in a polarization attribute sequence composed of the plurality of polarization attributes, the elements of the polarization attribute sequence are in one-to-one correspondence with the plurality of polarization attributes, the polarization attribute sequence comprises 16 elements, and polarization attributes corresponding to 4 elements arranged in succession in the 16 elements have higher sensitivity to changes in the measured skin physiological parameter than polarization attributes corresponding to other elements of the polarization attribute sequence.

12. The apparatus of claim 10 or 11, wherein the modulatable polarizer/analyzer set comprises a plurality of polarizers and a plurality of analyzers, wherein polarizing and analyzing the light emitted by the emitting module and the light reflected by the skin region under test, respectively, according to the preset modulation pattern by the modulatable polarizer/analyzer set comprises:

13. The apparatus according to claim 10 or 11, wherein the light emitted by the emitting module includes light having a first code and a second code at the same wavelength, and polarization properties corresponding to the first code and the second code are demodulated to derive the measured skin physiological parameter.